Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 340, Issue 1, Pages 12-28Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-8711.2003.06170.x
Keywords
galaxies : dwarf; galaxies : fundamental parameters; galaxies : individual : NGC 6822; galaxies : kinematics and dynamics; Local Group; dark matter
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We present high-resolution rotation curves of the Local Group dwarf irregular galaxy NGC 6822 obtained with the Australia Telescope Compact Array. Our best curves have an angular resolution of 8 arcsec or 20 pc and contain some 250 independent points. The stellar and gas components of NGC 6822 cannot explain the shape of the curve, except for the very inner regions, and NGC 6822 is consequently very dark-matter-dominated. There is no evidence for the presence of a steep density cusp down to scales of similar to20 pc, contrary to the predictions of cold dark matter.
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